Docosahexaenoyl chains isomerize on the sub-nanosecond time scale

被引：43

作者：

Soubias, Olivier ^{[1
]}

Gawrisch, Klaus ^{[1
]}

机构：

[1] NIAAA, Lab Membrane Biochem & Biophys, NIH, Bethesda, MD 20892 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2007年 / 129卷 / 21期

关键词：

D O I：

10.1021/ja068856c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The dynamics of docosahexaenoyl acyl chains (DHA) in 18:0-22:6n3-PC bilayers were studied by C-13 MAS NMR relaxation measurements. A Lipari-Szabo-type analysis yielded site-specific correlation times of DHA chain isomerization and C-H bond order parameters. It is concluded that DHA chains perform rapid isomerization with correlation times from 80 ps near the carbonyl group to 8 ps near the terminal methyl group. Spin-lattice relaxation rates remained unaltered after rhodopsin incorporation into the bilayers, indicating that the majority of lipids maintain their rapid chain isomerization in the presence of the protein. However, spin-spin relaxation rates revealed that rhodopsin increased motional correlation times of slow collective DHA motions.

引用

页码：6678 / +

页数：3

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